Estimation of Nuclear Genome Size of Three Species of Camponotus (Mayr, 1861) (Hymenoptera: Formicidae: Formicinae) and Their Cytogenetic Relationship

Authors

  • Hilton Jeferson Alves Cardoso de Aguiar Programa de Pós-graduação em Genética e Melhoramento, Departamento de Biologia Geral, Universidade Federal de Viçosa, Viçosa - Minas Gerais - Brazil Universidade Federal do Amapá, Campus Binacional, Oiapoque - Amapá, Brazil
  • Luísa Antônia Campos Barros Programa de Pós-graduação em Genética e Melhoramento, Departamento de Biologia Geral, Universidade Federal de Viçosa, Viçosa - Minas Gerais - Brazil Universidade Federal do Amapá, Campus Binacional, Oiapoque - Amapá, Brazil
  • Fernanda Aparecida Ferrari Soares Programa de Pós-graduação em Genética e Melhoramento, Departamento de Biologia Geral, Universidade Federal de Viçosa, Viçosa - Minas Gerais - Brazil
  • Carlos Roberto de Carvalho Programa de Pós-graduação em Genética e Melhoramento, Departamento de Biologia Geral, Universidade Federal de Viçosa, Viçosa - Minas Gerais - Brazil
  • Silvia das Graças Pompolo Programa de Pós-graduação em Genética e Melhoramento, Departamento de Biologia Geral, Universidade Federal de Viçosa, Viçosa - Minas Gerais - Brazil

DOI:

https://doi.org/10.13102/sociobiology.v63i2.948

Keywords:

flow cytometry, chromosome number, genome size, evolution, ants

Abstract

The chromosome variability among ant species is remarkable, and the processes generating such variation are still under discussion since polyploidy has been observed in some distinct taxa. The chromosome number of species belonging to the Camponotus, subgenera Myrmothrix and Myrmobrachys, are highly different, whereas, the first subgenus has double the number of chromosomes of the second. In order to test the hypothesis of chromosome number doubling through polyploidy, the genome sizes of Camponotus (Myrmothrix) rufipes, Camponotus (Myrmothrix) renggeri and Camponotus (Myrmobrachys) crassus were estimated by flow cytometry. The chromosome number of specimens from the nests studied was also defined. No significant variation was noted in the genome size among them. The mean haploid genome size value (1C) of workers for the three species was 286.16 Mpb (0.29 pg). The polyploidy hypothesis can be ruled out as an evolutionary step linking the karyotype variations among the three studied species since the genome size of C. crassus with 2n = 20 chromosomes was the same as that of C. rufipes and C. renggeri with 2n = 40. The lack of variation in the amount of DNA between the related species C. rufipes and C. renggeri also demonstrate that flow cytometry is not an adequate approach to distinguish them. Our results highlight the importance of combining distinct methods, DNA quantification, and cytogenetics from the same colony. Understanding the path of chromosome evolution of three species with distinct degrees of relatedness should provide further information in enriching our knowledge about the Minimum Interaction Theory.

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Published

2016-07-20

How to Cite

Aguiar, H. J. A. C. de, Barros, L. A. C., Soares, F. A. F., Carvalho, C. R. de, & Pompolo, S. das G. (2016). Estimation of Nuclear Genome Size of Three Species of Camponotus (Mayr, 1861) (Hymenoptera: Formicidae: Formicinae) and Their Cytogenetic Relationship. Sociobiology, 63(2), 777–782. https://doi.org/10.13102/sociobiology.v63i2.948

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Section

Research Article - Ants

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